{"paper":{"title":"$R_b$ in supergravity models","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"D. Nanopoulos, J. Lopez, X. Wang","submitted_at":"1995-01-10T16:42:18Z","abstract_excerpt":"We compute the supersymmetric contribution to\n $R_{b}\\equiv \\Gamma (Z\\to b{\\bar b})/\\Gamma (Z\\to {\\rm hadrons})$ in a variety of supergravity models. We find $R^{\\rm susy}_b\\lsim0.0004$, which does not shift significantly the Standard Model prediction\n ($R^{\\rm SM}_b=0.2162$ for $m_t=160\\GeV$). An improvement in experimental precision by a factor of four would be required to be sensitive to such an effect."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9501258","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}